How many movies have Kazuo Umezz and Masakazu Oka collaborated on?

They have worked on 3 movies together! Their first movie together was Kazuo Umezu's Horror Theater: Diet (2005) while their highest rated movie together was Tamami: The Baby's Curse (2008). They have not worked together since Tamami: The Baby's Curse (2008). They are most known for their horror films together.